/* ─── tokens ──────────────────────────────────────────── */
:root {
  --bg:        #0c0c0e;
  --surf:      #111115;
  --surf2:     #16161b;
  --surf3:     #1c1c23;
  --brd:       #22222c;
  --brd2:      #2e2e3c;
  --txt:       #dddde8;
  --txt2:      #8888a0;
  --txt3:      #50505f;
  --a1:        #5b8af5;   /* blue */
  --a2:        #e06c8a;   /* rose */
  --a3:        #3ecfa6;   /* teal */
  --a4:        #e0a04a;   /* amber */
  --a5:        #a07ef5;   /* violet */
  --a6:        #5bc8e0;   /* cyan */
  --mono: 'IBM Plex Mono', monospace;
  --sans: 'DM Sans', sans-serif;
  --lw: 240px;
  --sh: 36px;
  --sidebar: 380px;
}

/* ─── light theme overrides ───────────────────────────── */
[data-theme="light"] {
  --bg:    #f4f4f7;
  --surf:  #ffffff;
  --surf2: #f0f0f4;
  --surf3: #e6e6ec;
  --brd:   #dcdce6;
  --brd2:  #c8c8d8;
  --txt:   #1a1a2e;
  --txt2:  #606080;
  --txt3:  #a0a0b8;
  --a1:    #4070e8;
  --a2:    #d04470;
  --a3:    #22aa80;
}

[data-theme="light"] .g-hdr        { background: #ebebf0; }
[data-theme="light"] #tip          { background: #ffffff; }
[data-theme="light"] #toast        { background: #fff0f4; }
[data-theme="light"] .gantt-wrap   { background: var(--surf); }
[data-theme="light"] .g-row.threaded { background: rgba(0,0,0,.018); }
[data-theme="light"] .g-row:hover    { background: rgba(64,112,232,.04); }
[data-theme="light"] .bar            { box-shadow: 0 1px 4px rgba(0,0,0,.15); }

/* ─── theme toggle button ─────────────────────────────── */
.icon-btn {
  background: none;
  border: 1px solid var(--brd2);
  border-radius: 6px;
  color: var(--txt2);
  cursor: pointer;
  padding: 5px 8px;
  display: flex;
  align-items: center;
  transition: color .12s, border-color .12s;
  flex-shrink: 0;
}
.icon-btn:hover { color: var(--txt); border-color: var(--a1); }
.icon-btn svg   { width: 15px; height: 15px; display: block; }

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; overflow: hidden; }
body {
  background: var(--bg);
  color: var(--txt);
  font-family: var(--mono);
  font-size: 12px;
  display: flex;
  flex-direction: column;
}

/* ─── topbar ──────────────────────────────────────────── */
#topbar {
  height: 48px;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 20px;
  border-bottom: 1px solid var(--brd);
  background: var(--surf);
  flex-shrink: 0;
  z-index: 40;
}
.logo {
  font-family: var(--sans);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: -.3px;
  color: var(--txt);
  display: flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
}
.logo-dot {
  width: 8px;
  height: 8px;
  background: var(--a1);
  border-radius: 50%;
  flex-shrink: 0;
  box-shadow: 0 0 8px var(--a1);
}

.seg {
  display: flex;
  background: var(--bg);
  border: 1px solid var(--brd);
  border-radius: 6px;
  padding: 2px;
  gap: 2px;
}
.seg-btn {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 500;
  padding: 4px 13px;
  border-radius: 4px;
  border: none;
  background: none;
  color: var(--txt2);
  cursor: pointer;
  transition: .12s;
  white-space: nowrap;
}
.seg-btn.on { background: var(--surf3); color: var(--txt); }
.seg-btn:hover:not(.on) { color: var(--txt); }

.spacer { flex: 1; }

.tbtn {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 500;
  padding: 6px 14px;
  border-radius: 6px;
  border: 1px solid var(--brd2);
  background: none;
  color: var(--txt2);
  cursor: pointer;
  transition: .12s;
  white-space: nowrap;
}
.tbtn:hover { color: var(--txt); border-color: var(--a1); }
.tbtn.primary { background: var(--a1); color: #fff; border-color: var(--a1); }
.tbtn.primary:hover { background: #4878d8; }

/* ─── layout ──────────────────────────────────────────── */
#main { display: flex; flex: 1; overflow: hidden; }

/* ─── sidebar ─────────────────────────────────────────── */
#sidebar {
  width: var(--sidebar);
  flex-shrink: 0;
  border-right: 1px solid var(--brd);
  display: flex;
  flex-direction: column;
  background: var(--surf);
  overflow: hidden;
}
.panel { display: flex; flex-direction: column; flex: 1; overflow: hidden; }
.panel-hdr {
  padding: 12px 16px;
  border-bottom: 1px solid var(--brd);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}
.panel-hdr-title { font-family: var(--sans); font-weight: 700; font-size: 12px; color: var(--txt); }
.shbtn {
  font-family: var(--mono);
  font-size: 10px;
  padding: 4px 10px;
  border: 1px solid var(--brd2);
  border-radius: 5px;
  background: none;
  color: var(--txt2);
  cursor: pointer;
  transition: .12s;
}
.shbtn:hover { color: var(--txt); border-color: var(--a1); }

/* ─── csv panel ───────────────────────────────────────── */
#csvDropZone {
  margin: 12px;
  border: 2px dashed var(--brd2);
  border-radius: 10px;
  padding: 24px 16px;
  text-align: center;
  cursor: pointer;
  transition: .15s;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  background: var(--surf2);
}
#csvDropZone:hover,
#csvDropZone.over { border-color: var(--a1); background: rgba(91, 138, 245, .06); }

.dz-icon  { font-size: 24px; opacity: .5; }
.dz-title { font-family: var(--sans); font-weight: 600; font-size: 13px; }
.dz-sub   { color: var(--txt2); font-size: 10px; line-height: 1.7; }

#fileInput { display: none; }

.csv-body {
  display: flex;
  flex-direction: column;
  flex: 1;
  overflow: hidden;
  padding: 0 12px 12px;
}
.lbl {
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--txt2);
  margin: 10px 0 5px;
}
#csvText {
  flex: 1;
  background: var(--bg);
  border: 1px solid var(--brd2);
  border-radius: 8px;
  color: var(--txt);
  font-family: var(--mono);
  font-size: 10.5px;
  padding: 10px;
  resize: none;
  outline: none;
  line-height: 1.65;
  transition: .12s;
}
#csvText:focus { border-color: var(--a1); }

.hint {
  margin-top: 8px;
  background: var(--surf2);
  border: 1px solid var(--brd);
  border-radius: 7px;
  padding: 9px 11px;
  font-size: 9.5px;
  color: var(--txt2);
  line-height: 1.8;
}
.hint b { color: var(--a1); }

/* ─── table editor ────────────────────────────────────── */
.tbl-wrap { flex: 1; overflow-y: auto; overflow-x: hidden; }
.tbl-wrap::-webkit-scrollbar { width: 4px; }
.tbl-wrap::-webkit-scrollbar-thumb { background: var(--brd2); border-radius: 2px; }

#taskTbl { width: 100%; border-collapse: collapse; }
#taskTbl th {
  position: sticky;
  top: 0;
  z-index: 2;
  background: var(--surf);
  padding: 7px 5px;
  font-size: 8.5px;
  text-transform: uppercase;
  letter-spacing: .8px;
  color: var(--txt2);
  border-bottom: 1px solid var(--brd);
  text-align: left;
}
#taskTbl td { padding: 2px 3px; border-bottom: 1px solid var(--brd); }
#taskTbl tr:hover td { background: rgba(255, 255, 255, .015); }

.cin {
  width: 100%;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 3px;
  color: var(--txt);
  font-family: var(--mono);
  font-size: 10.5px;
  padding: 3px 5px;
  outline: none;
  transition: .1s;
}
.cin:focus { border-color: var(--a1); background: var(--surf2); }
.cin::placeholder { color: var(--txt3); }
.cin.cdur { color: var(--a3); }
.cin.cthr { color: var(--a1); }

.del-btn {
  background: none;
  border: none;
  color: var(--txt3);
  cursor: pointer;
  font-size: 13px;
  padding: 2px 6px;
  border-radius: 3px;
  transition: .1s;
  line-height: 1;
}
.del-btn:hover { color: var(--a2); }

.tbl-foot { padding: 9px 12px; border-top: 1px solid var(--brd); flex-shrink: 0; }

/* ─── chart area ──────────────────────────────────────── */
#chartArea { flex: 1; display: flex; flex-direction: column; overflow: hidden; }

#chartEmpty {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
}
.empty-icon  { font-size: 40px; opacity: .15; }
.empty-title { font-family: var(--sans); font-weight: 600; font-size: 15px; color: var(--txt2); }
.empty-sub   { font-size: 10px; color: var(--txt3); }

#chartScroll { flex: 1; overflow: auto; padding: 20px; }
#chartScroll::-webkit-scrollbar { width: 5px; height: 5px; }
#chartScroll::-webkit-scrollbar-thumb { background: var(--brd2); border-radius: 3px; }

/* ─── gantt chart ─────────────────────────────────────── */
.gantt-wrap {
  border: 1px solid var(--brd);
  border-radius: 10px;
  overflow: hidden;
  background: var(--surf);
  min-width: 500px;
}
.g-hdr {
  display: flex;
  border-bottom: 2px solid var(--brd);
  background: #0a0a0d;
  position: sticky;
  top: 0;
  z-index: 10;
}
.g-lbl-hdr {
  min-width: var(--lw);
  width: var(--lw);
  padding: 9px 14px;
  font-size: 9px;
  color: var(--txt2);
  text-transform: uppercase;
  letter-spacing: 1px;
  border-right: 1px solid var(--brd);
  flex-shrink: 0;
}
.tl-hdr { flex: 1; position: relative; height: 36px; overflow: hidden; }
.tick {
  position: absolute;
  top: 0;
  height: 100%;
  border-left: 1px solid var(--brd);
  display: flex;
  align-items: flex-end;
  padding-bottom: 6px;
  padding-left: 4px;
  font-size: 9px;
  color: var(--txt2);
  white-space: nowrap;
}

.g-row { display: flex; border-bottom: 1px solid var(--brd); transition: background .1s; }
.g-row:last-child { border-bottom: none; }
.g-row:hover { background: rgba(91, 138, 245, .03); }
.g-row.threaded { background: rgba(255, 255, 255, .008); }

.g-lbl {
  min-width: var(--lw);
  width: var(--lw);
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 0 10px;
  border-right: 1px solid var(--brd);
  flex-shrink: 0;
  gap: 2px;
  overflow: hidden;
}
.g-lbl-inner { display: flex; align-items: center; gap: 6px; overflow: hidden; }
.g-lbl-inner span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 10.5px; }

.tpill {
  flex-shrink: 0;
  font-size: 8px;
  font-weight: 600;
  padding: 2px 5px;
  border-radius: 99px;
  letter-spacing: .7px;
  text-transform: uppercase;
}
.sublayer-note { font-size: 9px; color: var(--txt2); font-style: italic; }

.g-timeline { flex: 1; display: flex; flex-direction: column; }
.sublayer { position: relative; height: var(--sh); flex-shrink: 0; }
.sublayer + .sublayer { border-top: 1px dashed rgba(255, 255, 255, .05); }
.sl-indent { position: absolute; left: 0; top: 0; bottom: 0; opacity: .25; }

.bar {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  height: 20px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  padding: 0 7px;
  font-size: 9px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  cursor: pointer;
  transition: filter .12s, transform .12s;
  box-shadow: 0 1px 6px rgba(0, 0, 0, .5);
  color: rgba(255, 255, 255, .9);
  z-index: 2;
}
.bar:hover { filter: brightness(1.35); transform: translateY(-50%) scaleY(1.1); z-index: 5; }

.gline {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--brd);
  opacity: .22;
  pointer-events: none;
  z-index: 1;
}

/* ─── stats bar ───────────────────────────────────────── */
#statsBar {
  display: none;
  padding: 10px 20px;
  border-top: 1px solid var(--brd);
  background: var(--surf);
  flex-wrap: wrap;
  gap: 10px;
  flex-shrink: 0;
}
.stat { background: var(--bg); border: 1px solid var(--brd); border-radius: 6px; padding: 7px 14px; }
.stat-lbl { color: var(--txt2); font-size: 9px; text-transform: uppercase; letter-spacing: 1px; }
.stat-val  { font-family: var(--sans); font-weight: 700; font-size: 16px; color: var(--a1); margin-top: 1px; }

/* ─── tooltip ─────────────────────────────────────────── */
#tip {
  display: none;
  position: fixed;
  background: #111118;
  border: 1px solid var(--brd2);
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 10.5px;
  line-height: 1.85;
  z-index: 1000;
  pointer-events: none;
  box-shadow: 0 8px 28px rgba(0, 0, 0, .7);
  max-width: 290px;
}
.tn { font-family: var(--sans); font-weight: 700; font-size: 13px; margin-bottom: 4px; }
.tk { color: var(--txt2); font-size: 9.5px; }

/* ─── toast ───────────────────────────────────────────── */
#toast {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(60px);
  background: #200a12;
  border: 1px solid var(--a2);
  color: var(--a2);
  border-radius: 8px;
  padding: 9px 18px;
  font-size: 11px;
  z-index: 200;
  transition: transform .22s;
  max-width: 480px;
  text-align: center;
}
#toast.show { transform: translateX(-50%) translateY(0); }

/* ─── resize handle ───────────────────────────────────── */
#resizer {
  width: 4px;
  background: var(--brd);
  cursor: col-resize;
  flex-shrink: 0;
  transition: background .15s;
}
#resizer:hover { background: var(--a1); }

/* ─── button danger variant ───────────────────────────── */
.shbtn.danger { color: var(--a2); border-color: var(--a2); }
.shbtn.danger:hover { background: rgba(224, 108, 138, .08); }

/* ════════════════════════════════════════════════════════
   MOBILE  (≤ 700px)
   Strategy:
   - Stack sidebar above chart (full-width panels)
   - Hide desktop top-bar input tabs + resizer
   - Add bottom nav to toggle Input / Chart views
   - Shrink gantt label column
   - Touch tooltip: tap bar → sheet slides up from bottom
   ════════════════════════════════════════════════════════ */

/* ─── bottom nav (mobile only) ────────────────────────── */
#bottomNav {
  display: none;
}

@media (max-width: 700px), (max-height: 500px) and (orientation: landscape) {

  /* Allow page to scroll naturally on mobile */
  html, body { overflow: auto; height: auto; }
  body { min-height: 100dvh; }

  /* Topbar: hide desktop panel tabs, keep logo + actions */
  .seg     { display: none; }
  .spacer  { display: none; }
  #topbar  { gap: 10px; padding: 0 14px; justify-content: space-between; }
  .tbtn    { padding: 5px 11px; font-size: 9.5px; }

  /* Main becomes vertical stack, no overflow:hidden */
  #main {
    flex-direction: column;
    overflow: visible;
    flex: none;
  }

  /* Sidebar: full width, natural height, no fixed right border */
  #sidebar {
    width: 100% !important;   /* override JS inline style */
    border-right: none;
    border-bottom: 1px solid var(--brd);
    overflow: visible;
    flex-shrink: 0;
  }

  /* Panels scroll naturally */
  .panel { overflow: visible; }
  .csv-body { overflow: visible; }
  #csvText  { min-height: 160px; resize: vertical; }

  /* Table editor: allow horizontal scroll */
  .tbl-wrap { overflow-x: auto; overflow-y: auto; max-height: 360px; }

  /* Hide resizer on mobile */
  #resizer { display: none; }

  /* Chart area: natural height, don't grow to fill */
  #chartArea { flex: none; display: flex; flex-direction: column; }
  #chartArea.visible { min-height: 60dvh; }
  #chartScroll { flex: 1; overflow: auto; -webkit-overflow-scrolling: touch; padding: 12px; }
  #chartEmpty  { min-height: 200px; }

  /* Gantt: narrower label column */
  :root { --lw: 130px; --sh: 40px; }
  .g-lbl-inner span { font-size: 9.5px; }
  .gantt-wrap { min-width: 0; border-radius: 8px; }

  /* Stats: wrap tightly */
  #statsBar { padding: 8px 12px; gap: 7px; }
  .stat { padding: 5px 10px; }
  .stat-val { font-size: 13px; }

  /* Bottom nav */
  #bottomNav {
    display: flex;
    position: sticky;
    bottom: 0;
    z-index: 50;
    background: var(--surf);
    border-top: 1px solid var(--brd);
    height: 54px;
    flex-shrink: 0;
  }
  .bnav-btn {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 3px;
    background: none;
    border: none;
    color: var(--txt2);
    font-family: var(--mono);
    font-size: 9px;
    cursor: pointer;
    transition: color .12s;
    -webkit-tap-highlight-color: transparent;
  }
  .bnav-btn.on { color: var(--a1); }
  .bnav-btn svg { width: 18px; height: 18px; }

  /* Mobile tooltip: slides up from bottom as a sheet */
  #tip {
    display: block;           /* always in DOM, moved off-screen by transform */
    position: fixed;
    left: 0; right: 0; bottom: 0;
    max-width: 100%;
    border-radius: 14px 14px 0 0;
    border: 1px solid var(--brd2);
    border-bottom: none;
    padding: 16px 20px 24px;
    font-size: 12px;
    line-height: 2;
    pointer-events: none;
    z-index: 2000;
    box-shadow: 0 -8px 32px rgba(0,0,0,.7);
    transform: translateY(110%);
    transition: transform .22s cubic-bezier(.32,1,.38,1);
    visibility: hidden;       /* prevent interaction while off-screen */
  }
  #tip.visible {
    transform: translateY(0);
    pointer-events: auto;
    visibility: visible;
  }
  .tip-drag-handle {
    display: block;
    width: 36px; height: 4px;
    background: var(--brd2);
    border-radius: 2px;
    margin: 0 auto 12px;
  }
  .tn { font-size: 14px; }
  .tk { font-size: 10px; }

  /* Bars: slightly taller for touch targets */
  .bar { height: 26px; }
  .bar:active { filter: brightness(1.35); transform: translateY(-50%) scaleY(1.1); }

  /* Toast: always hides below viewport, account for bottom nav */
  #toast { bottom: 64px; transform: translateX(-50%) translateY(200px); }
  #toast.show { transform: translateX(-50%) translateY(0); }
}

/* ─── landscape phone tweaks ──────────────────────────── */
@media (max-height: 500px) and (orientation: landscape) {

  /* Compact bottom nav: row of small buttons, less height */
  #bottomNav { height: 40px; }
  .bnav-btn  { font-size: 8px; gap: 2px; }
  .bnav-btn svg { width: 14px; height: 14px; }

  /* Chart takes full remaining height */
  #chartArea { min-height: 0; flex: 1; }
  #chartScroll { padding: 8px; }

  /* Tighter gantt rows */
  :root { --sh: 32px; --lw: 110px; }

  /* Textarea shorter in landscape */
  #csvText { min-height: 80px; }

  /* Toast above compact nav */
  #toast { bottom: 50px; }
}